參數(shù)資料
型號： LM3557SD-2
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Step-Up Converter for White LED Applications
中文描述： 1.1 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 1 MM HEIGHT, LLP-8
文件頁數(shù)： 3/11頁
文件大小： 642K
代理商： LM3557SD-2
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN
Pin
En Pin
Fb Pin
Sw2 Pin
Ovp Pin
Sw1 Pin
Continuous Power Dissipation
Maximum Junction Temperature
(T
J-MAX
)
Storage Temperature Range
0.3V to +8V
0.3V to +8V
0.3V to +8V
0.3V to +8V
0.3V to +30V
0.3V to +40V
Internally Limited
+150C
65C to +150C
ESD Rating (Note 2)
Human Body Model
Machine Model
2 kV
150V
Operating Conditions
(Notes 1, 6)
Junction Temperature (T
J
) Range
Ambient Temperature (T
A
) Range
Supply Voltage, V
IN
Pin
En Pin
40C to +125C
40C to +85C
2.7V to 7.5V
0V to V
IN
+0.4V
Thermal Properties
(Notes 4, 7)
Junction-to-Ambient Thermal
Resistance (
θ
JA
), Leadless Leadframe Package
55C/W
Electrical Characteristics
(Notes 6, 8)
face
apply over the full operating junction temperature range (40C
≤
T
J
≤
+125C). Unless otherwise specified: V
IN
= 3.6V.
Limits in standard typeface are for T
J
= 25C. Limits in
bold type-
Symbol
V
IN
I
Q
Parameter
Conditions
Min
2.7
Typ
Max
7.5
2
0.8
Units
V
μA
mA
Input Voltage
Quiescent Current
V
EN
= 0V (Shutdown)
V
EN
= 1.8V; V
OVP
= 27V
(Non-Switching)
Device On
Device Off
V
IN
= 3V
0.01
0.55
En
Device Enable Threshold
0.9
0.3
V
I
CL
Power Switch Current Limit
(Note 10)
Power Switch ON Resistance
R
DS(ON)
Temperature
Coefficient
Over-Voltage Protection (Note
5)
Under-Voltage Protection (Note
5)
Over-Voltage Protection Pin
Bias Current (Note 3)
Enable Pin Bias Current (Note
3)
Switching Frequency
Feedback Pin Voltage (Note 9)
Feedback Pin Bias Current
(Note 3)
Maximum Duty Cycle
Sw1 Pin Leakage Current (Note
3)
Sw2 Pin Leakage Current (Note
3)
Ovp Pin Leakage Current (Note
3)
Sw2 Pin Switch Resistance
R
Sw2
Temperature Coefficient
0.4
0.55
0.8
0.8
800
1.1
1.02
1000
A
R
DS(ON)
TC
(R
DS(ON)
)
OVP
I
Sw1
= 175 mA
m
0.5
%/C
On Threshold
Off Threshold
On Threshold
Off Threshold
22
21.5
26
25.5
2.2
2.3
28.5
28
V
UVP
V
I
OVP
4
10
μA
I
EN
V
EN
= 1.8V
0.8
3
μA
F
S
V
Fb-Sw2
I
Fb
V
IN
= 3V
0.9
0.459
1.25
0.51
1.6
0.561
MHz
V
0.03
2
μA
D
MAX
I
LSw1
V
IN
= 3V
V
Sw1
= 3.6V, Not Switching
85
90
%
0.002
2
μA
I
LSw2
V
Sw2
= 3.6V, Not Switching
0.001
1
μA
I
LOVP
V
Ovp
= 3.6V, Not Switching
2
nA
R
Sw2
TC(R
Sw2
)
I
Sw2
= 50 mA
8
10
0.5
%/C
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical characteristic specifications do not apply when
operating the device outside of its rated operating conditions.
Note 2:
The human body model is a 100 pF capacitor discharged through a 1.5 k
resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
L
www.national.com
3
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